Control method and device of air conditioning system, electronic equipment and storage medium

Abstract

The invention discloses a control method and device of an air conditioning system, electronic equipment and a storage medium, belongs to the technical field of power equipment, and aims to improve the operation efficiency of the air conditioning system. The method comprises the steps that the chilled water flow of the water chilling unit is controlled, the load of the water chilling unit is controlled to be smaller than or equal to the preset load, and the water inlet and outlet pressure difference formed by chilled water output by the water chilling unit in a tail end coil pipe is within the pressure difference range; the water inlet and outlet temperature difference of the chilled water in the water chilling unit is a preset temperature difference, and the approaching temperature difference is within a temperature difference range; controlling the operation frequency of the cooling water pump according to the cooling water inlet and outlet temperature difference of the cooling water pump; and according to the cooling water outlet temperature of the cooling tower, the operation frequency of a draught fan of the cooling tower is controlled, the air conditioner system comprises the water chilling unit, the cooling tower and the cooling water pump, and the operation efficiency of the air conditioner system is improved.

Description

Technical Field

[0001] This application belongs to the technical field of power equipment, and particularly relates to a control method, device, electronic device and storage medium for an air conditioning system. Background Art

[0002] A central air conditioning system consists of a chiller, a cooling pump, a chilled water pump, a cooling tower and terminals. In the current design of air conditioning systems, the flow rates of the chilled water pump and the cooling pump are approximately 1.2 times larger than the designed flow rates of the evaporator and the condenser. The flow rate of the cooling tower matches that of the cooling pump. Usually, during the operation of the chiller, it often does not reach full load operation. Therefore, when the chiller operates at part load, the chilled water flow rate can be reduced through variable frequency technology of the pump to achieve the purpose of energy saving for the pump. However, after the current chiller reduces the chilled water flow rate, the refrigeration efficiency of the chiller becomes worse, thus offsetting the power saved by the pump and resulting in a reduction in the working efficiency of the air conditioning system. Summary of the Invention

[0003] The embodiments of this application provide a control method, device, electronic device and storage medium for an air conditioning system, which can solve the problem that after the current chiller reduces the chilled water flow rate, the refrigeration efficiency of the chiller becomes worse, thus offsetting the power saved by the pump and resulting in a reduction in the working efficiency of the air conditioning system.

[0004] In a first aspect, the embodiments of this application provide a control method for an air conditioning system. The method includes: controlling the load of the chiller to be less than or equal to a preset load by controlling the chilled water flow rate of the chiller, where the differential pressure between the inlet and outlet water pressures formed by the chilled water output by the chiller in the terminal coil is within the differential pressure range, the differential temperature between the inlet and outlet water temperatures of the chilled water in the chiller is a preset differential temperature, and the approach differential temperature is within the differential temperature range; controlling the operating frequency of the fan of the cooling tower according to the cooling water outlet temperature of the cooling tower; controlling the operating frequency of the cooling water pump according to the differential temperature between the inlet and outlet cooling water temperatures of the cooling water pump, where the air conditioning system includes the chiller, the cooling tower and the cooling water pump. In a second aspect, the embodiments of this application provide a control device for an air conditioning system. The device includes: a first control module for controlling the load of the chiller to be less than or equal to a preset load by controlling the chilled water flow rate of the chiller, where the differential pressure between the inlet and outlet water pressures formed by the chilled water output by the chiller in the terminal coil is within the differential pressure range, the differential temperature between the inlet and outlet water temperatures of the chilled water in the chiller is a preset differential temperature, and the approach differential temperature is within the differential temperature range; a second control module for controlling the operating frequency of the fan of the cooling tower according to the cooling water outlet temperature of the cooling tower; a third control module for controlling the operating frequency of the cooling water pump according to the differential temperature between the inlet and outlet cooling water temperatures of the cooling water pump, where the air conditioning system includes the chiller, the cooling tower and the cooling water pump.

[0005] In a third aspect, an embodiment of the present application provides an electronic device, which includes a processor, a memory, and a program or instruction stored on the memory and executable on the processor. When the program or instruction is executed by the processor, the steps of the method described in the first aspect are implemented.

[0006] In a fourth aspect, an embodiment of the present application provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, the steps of the method described in the first aspect are implemented.

[0007] In an embodiment of the present application, by controlling the chilled water flow rate of the chiller, the load of the chiller is controlled to be less than or equal to a preset load. Among them, the pressure difference between the inlet and outlet water formed by the chilled water output by the chiller at the end coil is within the pressure difference range, the temperature difference between the inlet and outlet water of the chilled water in the chiller is a preset temperature difference, and the approach temperature difference is within the temperature difference range; a second control module is configured to control the operating frequency of the fan of the cooling tower according to the cooling water outlet temperature of the cooling tower; and control the operating frequency of the cooling water pump according to the temperature difference between the inlet and outlet cooling water of the cooling water pump. Among them, the air conditioning system includes the chiller, the cooling tower, and the cooling water pump, which can improve the operating efficiency of the air conditioning system. Description of the Drawings

[0008] Figure 1 is a schematic flowchart of a control method for an air conditioning system provided by an embodiment of the present application; Figure 2 is a schematic diagram of the operating frequency of a chiller under partial load provided by an embodiment of the present application; Figure 3 is a schematic diagram showing the relationship between the inlet temperature of the cooling water, the power consumption of the chiller, and cooling only provided by an embodiment of the present application; Figure 4 is a schematic diagram of a cooling tower cooling test provided by an embodiment of the present application; Figure 5 is a schematic structural diagram of a control device for an air conditioning system provided by an embodiment of the present application; Figure 6 is a schematic structural diagram of an electronic device provided by an embodiment of the present application. Detailed Embodiments

[0009] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0010] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0011] In the following, in conjunction with the accompanying drawings, the control method, device, electronic device and storage medium of the air-conditioning system provided in the embodiments of the present application are described in detail through specific embodiments and their application scenarios.

[0012] Figure 1 A control method for an air conditioning system provided by an embodiment of the present application is shown. The method can be executed by an electronic device, and the electronic device may include: an air conditioning system device. In other words, the method can be executed by software or hardware installed in the electronic device, and the method includes the following steps: Step 102: Control the load of the chiller to be less than or equal to a preset load by controlling the chilled water flow of the chiller.

[0013] Specifically, the air conditioning system consists of a chiller (also called a host), a cooling pump, a refrigeration pump, a cooling tower and a terminal. The flow of the refrigeration pump and the cooling pump is about 1.2 times the design flow of the evaporator and the condenser. The flow of the cooling tower matches the flow of the cooling pump. Usually, the chiller is not able to run at full load. Therefore, when the chiller is running at partial load, the water pump frequency conversion technology can be used to reduce the chilled water flow to achieve the purpose of water pump energy saving.

[0014] Normally, the chiller has requirements for the flow rate of chilled water. For example, the flow rate of chilled water for York centrifugal units must not be less than 40% of the rated flow rate of the chiller. The evaporator flow rate is allowed to vary within 40% to 120% of the rated flow rate. Maintaining a certain flow rate of water passing through the evaporator can avoid laminar flow in the evaporator, thereby making the evaporator have a higher heat exchange efficiency and preventing ice from forming. When the chiller is running at partial load, the amount of water passing through the chiller can be changed with the load, thereby reducing power consumption. Therefore, in the embodiment of the present application, the load of the chiller can be controlled to be less than or equal to the preset load by controlling the chilled water flow rate of the chiller.

[0015] However, when the chiller is operating at part load, it is necessary to ensure that the differential pressure between the inlet and outlet of the chilled water formed at the end coil by the chilled water output from the chiller is within the differential pressure range, the temperature difference between the inlet and outlet of the chilled water in the chiller is the preset temperature difference, and the approach temperature difference is within the temperature difference range.

[0016] In one implementation, the differential pressure range is 66 kPa to 75 kPa, the preset temperature difference is 5°C, and the temperature difference range is 0.8°C to 1.5°C.

[0017] Specifically, when controlling the chilled water flow rate of the chiller, the end needs to be considered. The end coil is controlled by a proportional-integral valve, and the water flow rate through the coil is automatically adjusted according to the room temperature controller, which causes a change in the flow rate of the system distribution loop and forms a change in the pressure difference between the supply and return mains. At the same time, the bypass valve of the differential pressure controller on the main pipeline is compensated to ensure sufficient flow through the chiller and also protect the differential pressure between the inlet and outlet of the end coil, generally requiring 66 KPA to 75 KPA to meet the requirements of the end coil. The chilled water flow rate in and out of the chiller is also related to the temperature difference between the inlet and outlet. The larger the chilled water flow rate, the smaller the temperature difference, and the smaller the chilled water flow rate, the larger the temperature difference. Therefore, it is reasonable to keep the temperature difference in the chiller at the preset temperature difference. In the embodiments of the present application, the preset temperature difference can be set to 5°C. The small temperature difference can also be called the approach temperature difference, which is also an important indicator for evaluating the efficiency of the chiller. In the embodiments of the present application, the small temperature difference needs to be maintained at 0.8°C - 1.5°C.

[0018] In one implementation, controlling the load of the chiller to be less than the preset load by controlling the chilled water flow rate of the chiller includes: controlling the chilled water flow rate of the chiller through the preset load, the refrigerating capacity, specific heat capacity, and temperature difference between the inlet and outlet of the chilled water of the chiller, so as to control the load of the chiller to be less than or equal to the preset load.

[0019] Specifically, the chilled water flow rate of the unit can be calculated by the following formula: V1 (m 3 / h) = 3.6 * Q1 / (4.187△T1) Wherein, V1 represents the chilled water volume, 3.6 represents time, Q1 represents the refrigerating capacity, 4.187 represents the specific heat capacity, and △T1 represents the temperature difference between the inlet and outlet of the chilled water.

[0020] For example, the rated refrigerating capacity of the chiller is 2953 KW, the operating load is 60%, and the operating refrigerating capacity is only 1770 KW. Through the formula 3.6 * 1770 / (4.187 * 5) = 304 m 3 / h, theoretically, the chilled water flow rate is controlled at 304 m 3 / h can meet the operation of the unit at 60% load. Therefore, in the embodiments of the present application, the chilled water flow of the chiller can be controlled by presetting the load, the refrigerating capacity of the chiller, the specific heat capacity, and the temperature difference between the inlet and outlet of the chilled water, so as to control the load of the chiller to be less than or equal to the preset load, where the preset load is 70% of the rated load of the chiller.

[0021] Step 104: Control the operating frequency of the cooling water pump according to the temperature difference between the inlet and outlet of the cooling water of the cooling water pump.

[0022] The cooling water flow is recommended to be not less than 70% of the rated flow of the unit. The refrigerating capacity and power consumption of the chiller are closely related to the cooling water temperature. The refrigerating capacity increases with the decrease of the cooling water inlet temperature, and the power consumption increases with the increase of the cooling water temperature. For example, for a centrifugal chiller with a refrigerating capacity of 2953KW, a power of 456KW, a cooling water flow of 590m 3 / h, and a cooling water pump flow of 700m 3 / h, and a head of 34 meters.

[0023] Figure 2 These are the data obtained when the centrifugal chiller controls the frequency of the cooling water pump manually under partial load, the chilled water pump adopts differential pressure control, the number of operating cooling towers remains unchanged, and the fan frequency is 50HZ.

[0024] In the embodiments of the present application, when the centrifugal chiller changes the chilled water flow under partial load, it does not have much impact on the efficiency of the centrifugal chiller. The chilled water flow of the chiller can be calculated to judge whether the air conditioning system is operating within a reasonable range. It is recommended to use differential pressure control to control the frequency of the chilled water pump more precisely. When the centrifugal chiller is at 55%-70% load, it is recommended to use the temperature difference between the inlet and outlet of the cooling water to control the frequency of the water pump, and a temperature difference of 4℃ has a better energy-saving effect.

[0025] In one implementation, the controlling the operating frequency of the cooling water pump according to the temperature difference between the inlet and outlet of the cooling water of the cooling water pump includes: increasing the operating frequency of the cooling water pump when the temperature difference between the inlet and outlet of the cooling water of the cooling water pump is greater than 4℃.

[0026] Specifically, in the embodiments of the present application, when controlling the operating frequency of the cooling water pump according to the temperature difference between the inlet and outlet of the cooling water of the cooling water pump, the operating frequency of the cooling water pump can be increased when the temperature difference between the inlet and outlet of the cooling water of the cooling water pump is greater than 4℃.

[0027] In one implementation, the controlling the operating frequency of the cooling water pump according to the temperature difference between the inlet and outlet of the cooling water of the cooling water pump includes: decreasing the operating frequency of the cooling water pump when the temperature difference between the inlet and outlet of the cooling water of the cooling water pump is less than or equal to 4℃.

[0028] Specifically, in the embodiments of the present application, according to the temperature difference between the inlet and outlet cooling water of the cooling water pump, the operating frequency of the cooling water pump can be controlled. When the temperature difference between the inlet and outlet cooling water of the cooling water pump is less than or equal to 4°C, the operating frequency of the cooling water pump can be reduced.

[0029] Step 106: Control the operating frequency of the fan of the cooling tower according to the outlet water temperature of the cooling water of the cooling tower.

[0030] Specifically, the cooling tower reduces the water temperature by directly transferring heat through air flow and converting liquid water into gas to absorb a large amount of heat, which is then carried away by the atmosphere. Generally, the water temperature is not lower than the ambient wet-bulb temperature. As Figure 3 shown, the refrigerating capacity and power consumption of the chiller are closely related to the cooling water temperature. The refrigerating capacity increases with the decrease of the inlet cooling water temperature, and the power consumption increases with the increase of the cooling water temperature. Reducing the outlet water temperature of the cooling tower can reduce the power consumption of the chiller and increase the refrigerating capacity.

[0031] The number of operating cooling towers should match the rated heat dissipation of the chiller. The frequency of the cooling fan varies according to the ambient temperature. The heat dissipation efficiency is mainly reflected in the inlet and outlet water temperatures (generally designed with a temperature difference of 5°C). When the cooling water temperature of the chiller is not lower than the minimum requirement, it should operate at the maximum frequency to ensure a lower inlet water temperature of the cooling water of the chiller. For example, the York centrifugal chiller requires that the cooling water cannot be lower than 14.8 degrees.

[0032] Reducing the cooling water flow rate actually reduces the heat dissipation capacity of the cooling tower. Slow flow rate reduces the circulation volume of the cooling water, resulting in a decrease in the heat exchange capacity of the chiller. The increase in the outlet water temperature increases the burden on the cooling tower, and the outlet water temperature of the cooling tower also rises accordingly. Although the cooling water pump operates at a low frequency to reduce power consumption, it increases the energy consumption of the chiller instead. When the cooling water flow rate increases, the heat exchange capacity of the chiller is improved to some extent. The cooling tower improves its heat dissipation capacity with the increase of the water circulation volume, and the outlet water temperature decreases. The efficiency of the chiller is improved and the power consumption is reduced, but the power consumption of the cooling water pump also increases accordingly. From Figure 3 it can be seen that when the temperature difference between the inlet and outlet cooling water of the chiller is 4°C, the power consumption of the chiller and the cooling water pump is the most ideal, and the small temperature difference of the condenser is also within the minimum range, proving that the heat exchange capacity of the chiller is good and the frequency of the variable-frequency cooling pump is the most appropriate.

[0033] As Figure 4 shown, when the chiller operates at a load of about 70% and the cooling water pump is set to operate automatically with a temperature difference of 4°C, when three cooling tower fans are turned on with the frequency adjusted to 40HZ and when three cooling tower fans are turned on with the frequency adjusted to 50HZ, the change in the inlet and outlet water temperatures of the cooling tower is not significant compared to the original situation of turning on two fans at 50HZ. The current of the chiller and the cooling water pump does not change. Turning on one more cooling tower is equivalent to increasing the power consumption of the fan motor.

[0034] In one implementation, controlling the operating frequency of the fan of the cooling tower according to the temperature difference between the inlet and outlet water temperatures of the cooling water of the cooling tower includes: when the outlet water temperature of the cooling water of the cooling tower is greater than the minimum water temperature threshold of the chiller, controlling the fan of the cooling tower to operate at the maximum operating frequency.

[0035] Specifically, the number of operating cooling towers is matched with the rated heat dissipation of the chiller, the temperature difference between the inlet and outlet water is below 5°C. When the outlet water temperature is greater than the minimum water temperature threshold required by the chiller, the cooling fan operates at the maximum power. In the transitional season or the refrigeration season, on the premise of ensuring the minimum cooling water temperature of the chiller, it is not recommended to reduce the frequency of the cooling tower fan. A lower cooling water temperature has a greater weight in energy saving for the chiller, and the more energy-efficient the chiller is. Increasing the frequency of the cooling water pump can save more energy by reducing the temperature on the cooling side. (The outlet water temperature of the cooling tower is controlled, the temperature difference of the cooling water pump is controlled, and for a fixed-frequency unit, for every one-degree reduction in the cooling water temperature, the energy saving is 1%-5%).

[0036] In one implementation, before controlling the fan of the cooling tower to operate at the maximum operating frequency, it further includes: determining the outlet water temperature of the cooling water of the cooling tower according to the ambient wet bulb temperature and the approach temperature, where the approach temperature is greater than 3°C and less than 7°C.

[0037] Specifically, when the cooling tower is designed to be undersized, it is beneficial to the overall energy saving for the cooling fan to operate at the maximum power. In one embodiment, if the cooling side is controlled by the outlet water temperature, it is recommended to set the outlet water temperature with a wet bulb temperature + 4°C approach temperature, which is of great significance in the transitional season. The approach temperature varies between greater than 3°C and less than 7°C and is estimated from the relative humidity. For example, when the outlet water temperature of the cooling tower in the natural cooling mode is 11°C, the outlet water temperature of the cooling tower in the transitional season and the refrigeration season is set to wet bulb + 4. If the frequency of the cooling water pump in the natural cooling mode is set by the outlet water temperature of 11°C, the outlet water frequency of the cooling water pump in the transitional season and the refrigeration mode is determined by the supply-return temperature difference.

[0038] The control method of the air conditioning system provided by the embodiment of the present application controls the chilled water flow rate of the chiller to control the load of the chiller to be less than or equal to a preset load. Among them, the pressure difference between the inlet and outlet water of the chilled water output by the chiller formed at the end coil is within the pressure difference range, the temperature difference between the inlet and outlet water of the chilled water in the chiller is a preset temperature difference, and the approach temperature difference is within the temperature difference range; the second control module is used to control the operating frequency of the fan of the cooling tower according to the cooling water outlet temperature of the cooling tower; and is used to control the operating frequency of the cooling water pump according to the temperature difference between the inlet and outlet water of the cooling water of the cooling water pump. Among them, the air conditioning system includes the chiller, the cooling tower and the cooling water pump. When the chiller operates at part load, the flow rate can be reduced through the variable frequency technology of the pump to achieve the purpose of energy saving of the pump. Moreover, after the chiller reduces the chilled water flow rate, the refrigeration efficiency of the chiller will not deteriorate, and the operating efficiency of the air conditioning system can be improved.

[0039] It should be noted that for the control method of the air conditioning system provided by the embodiment of the present application, the execution subject can be the control device of the air conditioning system, or the control module in the control device of the air conditioning system for executing the control method of the air conditioning system. In the embodiment of the present application, the control device of the air conditioning system executes the control method of the air conditioning system as an example to illustrate the control device of the air conditioning system provided by the embodiment of the present application.

[0040] Figure 5 It is a schematic structural diagram of the control device of the air conditioning system according to the embodiment of the present application. As Figure 5 shown, the control device 500 of the air conditioning system includes: a first control module 510, a second control module 520, and a third control module 530.

[0041] The first control module 510 is used to control the chilled water flow rate of the chiller to control the load of the chiller to be less than or equal to a preset load. Among them, the pressure difference between the inlet and outlet water of the chilled water output by the chiller formed at the end coil is within the pressure difference range, the temperature difference between the inlet and outlet water of the chilled water in the chiller is a preset temperature difference, and the approach temperature difference is within the temperature difference range; the second control module 520 is used to control the operating frequency of the fan of the cooling tower according to the cooling water outlet temperature of the cooling tower; the third control module 530 is used to control the operating frequency of the cooling water pump according to the temperature difference between the inlet and outlet water of the cooling water of the cooling water pump. Among them, the air conditioning system includes the chiller, the cooling tower and the cooling water pump.

[0042] In one implementation, the first control module 510 is used to control the chilled water flow rate of the chiller through the preset load, the refrigeration capacity, specific heat capacity and temperature difference between the inlet and outlet water of the chilled water of the chiller, so as to control the load of the chiller to be less than or equal to the preset load, where the preset load is 70% of the rated load of the chiller.

[0043] In one implementation, the third control module 520 is configured to control the fan of the cooling tower to operate at the maximum operating frequency when the outlet water temperature of the cooling water of the cooling tower is greater than the minimum water temperature threshold of the chiller.

[0044] In one implementation, the third control module 520 is further configured to determine the outlet water temperature of the cooling water of the cooling tower according to the ambient wet bulb temperature and the approach temperature, where the approach temperature is greater than 3°C and less than 7°C.

[0045] In one implementation, the second control module 520 is configured to increase the operating frequency of the cooling water pump when the temperature difference between the inlet and outlet of the cooling water of the cooling water pump is greater than 4°C.

[0046] In one implementation, the second control module 520 is configured to decrease the operating frequency of the cooling water pump when the temperature difference between the inlet and outlet of the cooling water of the cooling water pump is less than or equal to 4°C.

[0047] The control device of the air conditioning system in the embodiments of the present application may be a device, or a component, an integrated circuit, or a chip in a terminal. The device may be a mobile electronic device or a non-mobile electronic device. Exemplarily, the mobile electronic device may be a mobile phone, a tablet computer, a laptop computer, a handheld computer, a vehicle-mounted electronic device, a wearable device, an ultra-mobile personal computer (UMPC), a netbook, or a personal digital assistant (PDA), etc., and the non-mobile electronic device may be a server, a Network Attached Storage (NAS), a personal computer (PC), a television (TV), a teller machine, or a self-service machine, etc. The embodiments of the present application do not make specific limitations.

[0048] The control device of the air conditioning system in the embodiments of the present application may be a device with an operating system. The operating system may be an Android operating system, an iOS operating system, or other possible operating systems. The embodiments of the present application do not make specific limitations.

[0049] The control device of the air conditioning system provided by the embodiments of the present application can implement Figures 1 to 4 each process implemented by the method embodiments. To avoid repetition, it will not be elaborated here.

[0050] Such as Figure 6As shown in the figure, another embodiment of the present application provides an electronic device 600, including a processor 601 and a memory 602. A program or instruction that can run on the processor 601 is stored on the memory 602. When the program or instruction is executed by the processor 601, it realizes: by controlling the chilled water flow rate of the chiller, controlling the load of the chiller to be less than or equal to a preset load, where the pressure difference between the inlet and outlet water formed by the chilled water output by the chiller at the end coil is within the pressure difference range, the temperature difference between the inlet and outlet water of the chilled water in the chiller is a preset temperature difference, and the approach temperature difference is within the temperature difference range; controlling the operating frequency of the cooling water pump according to the temperature difference between the inlet and outlet water of the cooling water of the cooling water pump; controlling the operating frequency of the fan of the cooling tower according to the outlet water temperature of the cooling water of the cooling tower, where the air conditioning system includes the chiller, the cooling tower, and the cooling water pump.

[0051] In one implementation, by the preset load, the refrigerating capacity, specific heat capacity, and temperature difference between the inlet and outlet water of the chilled water of the chiller, the chilled water flow rate of the chiller is controlled to control the load of the chiller to be less than or equal to the preset load, where the preset load is 70% of the rated load of the chiller.

[0052] In one implementation, when the outlet water temperature of the cooling water of the cooling tower is greater than the minimum water temperature threshold of the chiller, the fan of the cooling tower is controlled to operate at the maximum operating frequency.

[0053] In one implementation, before controlling the fan of the cooling tower to operate at the maximum operating frequency, the outlet water temperature of the cooling water of the cooling tower is determined according to the ambient wet bulb temperature and the approach degree, where the approach degree is greater than 3°C and less than 7°C.

[0054] In one implementation, when the temperature difference between the inlet and outlet water of the cooling water of the cooling water pump is greater than 4°C, the operating frequency of the cooling water pump is increased.

[0055] In one implementation, when the temperature difference between the inlet and outlet water of the cooling water of the cooling water pump is less than or equal to 4°C, the operating frequency of the cooling water pump is decreased.

[0056] For the specific execution steps, reference can be made to the respective steps of the embodiment of the control method of the above air conditioning system, and the same technical effects can be achieved. To avoid repetition, it will not be elaborated here.

[0057] It should be noted that the electronic device in the embodiment of the present application includes: a server, a terminal, or other devices other than the terminal.

[0058] The above structure of the electronic device does not limit the electronic device. The electronic device may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements. For example, the input unit may include a Graphics Processing Unit (GPU) and a microphone, and the display unit may be configured with a display panel in the form of a liquid crystal display, an organic light-emitting diode, etc. The user input unit includes at least one of a touch panel and other input devices. The touch panel is also called a touch screen. Other input devices may include, but are not limited to, a physical keyboard, function keys (such as volume control keys, power on / off keys, etc.), a trackball, a mouse, and a joystick, which will not be elaborated here.

[0059] The memory can be used to store software programs and various data. The memory mainly includes a first storage area for storing programs or instructions and a second storage area for storing data. Among them, the first storage area can store an operating system, applications or instructions required for at least one function (such as a sound playback function, an image playback function, etc.). In addition, the memory can include volatile memory or non-volatile memory, or the memory can include both volatile and non-volatile memory. Among them, the non-volatile memory can be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable PROM (EEPROM), or a flash memory. The volatile memory can be a Random Access Memory (RAM), a Static RAM (SRAM), a Dynamic RAM (DRAM), a Synchronous DRAM (SDRAM), a Double Data Rate SDRAM (DDR SDRAM), an Enhanced SDRAM (ESDRAM), a Synchlink DRAM (SLDRAM), and a Direct Rambus RAM (DRRAM).

[0060] The processor may include one or more processing units; optionally, the processor integrates an application processor and a modem processor. Among them, the application processor mainly processes operations related to the operating system, user interface, application programs, etc., and the modem processor mainly processes wireless communication signals, such as a baseband processor. It can be understood that the above-mentioned modem processor may not be integrated into the processor either.

[0061] The embodiments of the present application further provide a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, it implements each process of the control method embodiment of the above air-conditioning system and can achieve the same technical effect. To avoid repetition, it will not be elaborated here.

[0062] Among them, the processor is the processor in the electronic device described in the above embodiments. The readable storage medium includes computer-readable storage media, such as ROM, RAM, magnetic disks, or optical discs, etc.

[0063] It should be noted that in this article, the term "including", "comprising", or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article, or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article, or device. Without more limitations, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article, or device including that element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the reverse order according to the functions involved. For example, the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. Additionally, the features described with reference to certain examples may be combined in other examples.

[0064] Through the description of the above embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus a necessary general hardware platform. Of course, it can also be implemented by hardware, but in many cases, the former is a better implementation method. Based on such an understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, can be embodied in the form of a computer software product. The computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disc), and includes several instructions to enable a terminal (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods described in various embodiments of the present application.

[0065] The embodiments of the present application have been described above in conjunction with the accompanying drawings. However, the present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative rather than restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms without departing from the purpose of the present application and the scope protected by the claims, and all of them fall within the protection scope of the present application.

Claims

1. A control method for an air conditioning system, characterized in that: include: By controlling the chilled water flow rate of the chiller, the load of the chiller is controlled to be less than or equal to the preset load, wherein the inlet and outlet water pressure difference formed by the chilled water output by the chiller at the terminal coil is within the pressure difference range, and the inlet and outlet water temperature difference of the chilled water at the chiller is the preset temperature difference, and the approaching temperature difference is within the temperature difference range; Controlling the operating frequency of the cooling water pump according to the temperature difference between the cooling water inlet and outlet of the cooling water pump; The operating frequency of the fan of the cooling tower is controlled according to the cooling water outlet temperature of the cooling tower, wherein the air conditioning system includes the chiller, the cooling tower and the cooling water pump.

2. The method according to claim 1, characterized in that: The method of controlling the load of the chiller to be less than a preset load by controlling the chilled water flow of the chiller comprises: The chilled water flow rate of the chiller is controlled by the preset load, the cooling capacity, specific heat capacity and the inlet and outlet temperature difference of the chiller to control the load of the chiller to be less than or equal to the preset load, wherein the preset load is 70% of the rated load of the chiller.

3. The method according to claim 1, characterized in that: The step of controlling the operating frequency of the fan of the cooling tower according to the temperature difference between the inlet and outlet water of the cooling water of the cooling tower comprises: When the cooling water outlet temperature of the cooling tower is greater than the minimum water temperature threshold of the chiller, the fan of the cooling tower is controlled to operate at a maximum operating frequency.

4. The method according to claim 3, characterized in that Before controlling the fan of the cooling tower to operate at the maximum operating frequency, the method further includes: The cooling water outlet temperature of the cooling tower is determined according to the ambient wet bulb temperature and the approximation degree, wherein the approximation degree is greater than 3°C and less than 7°C.

5. The method according to claim 1, characterized in that The step of controlling the operating frequency of the cooling water pump according to the temperature difference between the cooling water inlet and outlet of the cooling water pump comprises: When the temperature difference between the inlet and outlet water of the cooling water pump is greater than 4° C., the operating frequency of the cooling water pump is increased.

6. The method according to claim 1, characterized in that The step of controlling the operating frequency of the cooling water pump according to the temperature difference between the cooling water inlet and outlet of the cooling water pump comprises: When the temperature difference between the inlet and outlet water of the cooling water pump is less than or equal to 4° C., the operating frequency of the cooling water pump is reduced.

7. The method according to claim 1, characterized in that The pressure difference range is 66 kPa to 75 kPa, the preset temperature difference is 5°C, and the temperature difference range is 0.8°C to 1.5°C.

8. A control device for an air conditioning system, characterized in that: include: A first control module is used to control the load of the chiller to be less than or equal to a preset load by controlling the chilled water flow of the chiller, wherein the inlet and outlet water pressure difference formed by the chilled water output by the chiller at the terminal coil is within a pressure difference range, and the inlet and outlet water temperature difference of the chilled water at the chiller is a preset temperature difference, and the approaching temperature difference is within a temperature difference range; A second control module, used to control the operating frequency of the fan of the cooling tower according to the cooling water outlet temperature of the cooling tower; The third control module is used to control the operating frequency of the cooling water pump according to the temperature difference between the inlet and outlet water of the cooling water pump, wherein the air conditioning system includes the chiller, the cooling tower and the cooling water pump.

9. An electronic device, characterized in that: It includes a processor, a memory, and a program or instruction stored in the memory and executable on the processor, wherein the program or instruction, when executed by the processor, implements the steps of the control method of the air conditioning system as described in any one of claims 1 to 7.

10. A readable storage medium, characterized in that: The readable storage medium stores a program or instruction, and when the program or instruction is executed by the processor, the steps of the control method of the air-conditioning system according to any one of claims 1 to 7 are implemented.

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